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인가전압의 크기에 따른 2세대 고온 초전도선재의 열화특성에 관한 연구
박진형(Jinhyung Park),오승희(Seunghee O),박영훈(Younghun Park),Bimaridi Afif,조우현(Uhyeon Jo),신우철(Woochur Shin),Ragil Handito,박성건(Seongkeon Park),강형구(Hyoungku Kang) 한국조명·전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.4
2G High temperature superconducting (HTS) GdBCO conductors are usually considered as proper superconductors to develop a superconducting fault current limiter and a superconducting cable which are operated in a high voltage condition. 2G HTS GdBCO conductors manufactured by SuNAM Co., Ltd. can be classified by a metal stabilizer: silver, copper, brass, and stainless steel. In previous study, the electrical performance of 2G HTS GdBCO conductors with copper stabilizer according to electrical breakdown voltage is reported. In this study, dielectric experiments are performed in saturated liquid nitrogen (LN₂) at 77K temperature to analyze the characteristics of electrical degradation such as critical current and index number of 2G HTS GdBCO conductors with copper and brass stabilizer according to amplitude of applied voltage. All dielectric experiments are performed with AC and lightning impulse voltages by using a sphere-to-plane electrode system. It is found that the electrical performance of 2G HTS GdBCO conductors is degraded according to the amplitude of applied voltage.